The Science and Technology Directorate (DHS S&T) manages science and technology research for the Department of Homeland Security and first responders. It has six different primary divisions: the Explosives Division; the Chemical and Biological Division; the Command, Control, and Interoperability Division (whose responsibilities include securing critical infrastructure and coordinating efforts to improve existing cyber infrastructure); the Human Factors Division (focused on using behavioral sciences for detecting, analyzing and understanding homeland security threats); and the Infrastructure and Geophysical Division.